Public Law 70–920

That, in order to preserve for development, in whatever manner Congress may ultimately find most desirable, the natural resources in water, potential water power, and park and recreational facilities afforded by the falls and gorge of the Potomac River near the National Capital, the Federal Power Commission be and hereby is directed not to issue any permit, preliminary or final, to any private interest for the development of water power in the Potomac River between the mouth of Rock Creek and a point four miles upstream from the present intake for the water supply of Washington, until further action of Congress, after consideration of such joint report or separate reports as may be made by the National Capital Park and Planning Commission and the Federal Power Commission as to the best utilization of the said area for the public benefit.